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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcd7f0b06f324f43a92c3f893e7ce679884a2d33dd9b15378c9b2820a379272' 
  AND token = '+eKF/igFKKT2qLCZ0OsBaUdand3f80FLsjHNl9HpYr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}